Brake calipers endure some extreme conditions. Not only are they exposed to the elements but they also deal with extreme heating and cooling cycles. Brake calipers are pretty simple machines usually consisting of a single piston (sometimes more) that sits inside a bore and is sealed by a square cut seal. When you hit the brake the brake fluid pushes the brake piston outward to press the pads into the brake rotor. The square cut seal provides resistance as the piston extends as well as pulls it back in as you let go of the brake pedal.

Contamination from old brake fluid can corrode the piston and the square cut seal. Additionally, worn dust boots that protect the brake piston can also cause corrosion and failure of the brake caliper. Remanufactured brake calipers reuse the casting of the original part. The brake piston and all seals are replaced with new ones.

What If I Need to Return This Item?
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